Flow controllable liquid pump and working method thereof

ABSTRACT

The invention discloses a flow controllable liquid pump and working method thereof. The liquid pump comprises a fluid inlet, a fluid outlet, and a pump chamber, the fluid inlet and the fluid outlet respectively communicate with the pump chamber, the pump chamber is configured for introducing the fluid from the fluid inlet into the pump chamber and/or discharging the fluid from the pump chamber to the fluid outlet by periodical varying of the volume of the pump chamber; the liquid pump further comprises: a driving mechanism, the driving mechanism drives the pump chamber to vary the volume periodically by periodical rotating of the driving mechanism; a runner, the runner is driven by the driving mechanism and rotates periodically therewith; and a Hall sensor, the Hall sensor monitors the periodic change of the magnetic pole to generate a signal matching the rotation number of the driving mechanism.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The invention relates to the technical field of pumps, and more particularly, to a liquid pump.

2. Description of the Related Art

The working principle of diaphragm type micro water pump is as follows: a motor inside the pump drives the pump to do circular motion, and a mechanical means makes a diaphragm (the diaphragm takes many forms) inside the water pump do reciprocating motion, thereby compressing and stretching air inside the pump chamber. A pressure differential is created between a water outlet or a water inlet and external atmospheric pressure under the effect of a one-way valve. Then water is pushed into the water inlet and is discharged out from the water outlet under the effect of the pressure differential. Such a micro water pump has been well used in many industries, such as small home appliances, and medical equipments. However, for those micro water pumps, it is difficult to precisely adjust the water flow.

It is known that people skilled in the art have studied the control of flow of the water pump, and a micro water pump in which flow can be precisely controlled has been developed. The micro water pump comprises an upper cover, a valve seat, a water bag seat, base shell, water bags, a curved rod, a drive shaft, an eccentric wheel, motor and an output circuit board. The motor is installed on the base shell, a motor shaft of the motor extends into the base shell and is directly connected to the eccentric wheel inside the base shell. The eccentric wheel is connected to the curved rod through the drive shaft. The water bags are installed on a support at an upper end of the curved rod, wherein the support radiates outward. The water bags are installed on the water bag seat. The water bag seat is sealingly installed on the base shell. The valve seat is sealingly installed on the water bag seat. The valve seat has water inlets and water outlets for each of the water bags. One-way valves are respectively disposed on the water inlets and the water outlets. The upper cover is sealingly installed on the valve seat. The upper cover forms a water outlet port and a water inlet port. The water inlet port communicates with each of the water inlets, and the water outlet port communicates with each of the water outlets. When the water pump works, the motor drives the eccentric wheel to move, and the movement is transferred to the curved rod via the drive shaft, then the water bags are driven to allow water come in or out. Furthermore, the eccentric wheel or the motor shaft corresponds to a photoelectric switch in a radial direction to form a photoelectric shield. The photoelectric shield and the photoelectric switch work together to detect the rotational speed of the motor. The photoelectric switch is electrically connected to the output circuit board. The output circuit board is configured for being electrically connected to the external motor controller, and for sending the information of the rotational speed of the motor to the external motor controller. When the pump works, the rotational speed of the motor is detected by the photoelectric switch. The output circuit board sends the rotational speed to the external motor controller, so as to enable the motor controller to precisely control the rotational speed of the motor. Thus, different amount of stable water flow under different back pressures can be obtained.

The photoelectric switch has the advantages of long detection distance, few restrictions on the objects to be detected, short response time, so as to implement the non-contact detection. However, the unclosed photoelectric detection switch is prone to be affected by pollutants, which may affect the precise detection of the flow.

In addition, the conventional micro liquid pumps are fixed with three screws only between an upper cover and a middle cover. Therefore, although the upper cover and the middle cover may press a gasket arranged therebetween at a position where the screws are installed, since the pressure applied on the screws is reduced at the position where the screws are located, the gasket may not be tightly pressed, so that the liquid pump is not tightly sealed.

The conventional flow controllable liquid pump has a flow control device arranged inside the casing of the pump. When the flow control device is contaminated and needs to be cleaned, or when the flow control device requires maintenance, the only way is to remove the pump casing. However, it should be noted that other structures may be damaged when the pump casing is removed.

There is no effective solution to the above-mentioned problems that the photoelectric switch of the liquid pump is easily polluted and the flow control device is not easy to replace.

SUMMARY OF THE INVENTION

Given that the foregoing problems exist in the prior art, an object of the present invention is to provide a flow adjustable liquid pump.

For this purpose, the technical solution provided in the present invention is as follows:

a liquid pump, comprising: a fluid inlet, a fluid outlet, and a pump chamber, the fluid inlet and the fluid outlet being respectively communicate with the pump chamber, the pump chamber being configured for introducing the fluid from the fluid inlet into the pump chamber and/or discharging the fluid from the pump chamber to the fluid outlet by periodical varying of the volume of the pump chamber;

further comprising: a driving mechanism, the driving mechanism driving the pump chamber to vary the volume of the pump chamber periodically by periodical rotating of the driving mechanism;

further comprising:

a runner, the runner being driven by the driving mechanism and rotating periodically therewith, the periodical rotation of the runner causing a magnetic pole arranged thereon to change periodically; and

a Hall sensor, monitoring the periodic change of the magnetic pole to generate a signal matching the rotation number of the driving mechanism.

In the above-mentioned liquid pump, wherein at least a part of the pump chamber is made of a flexible component, the flexible component deforms reciprocately along a direction of its axis vary the volume periodically;

the liquid pump further comprises a transmission component, the driving mechanism drives the transmission component to rotate, the transmission component has an inclined surface, an angle is formed between the inclined surface and a radial surface of the flexible component, and the inclined surface rotates about the axis so that the flexible component deforms reciprocately along the direction of its axis.

In the above-mentioned liquid pump, wherein the driving mechanism is a motor, a motor shaft of the motor is fixedly connected to the runner;

the liquid pump further comprises a connecting rod for connecting the runner and the transmission component, an axis of the connecting rod form an angle with respect to an axis of the motor shaft.

In the above-mentioned liquid pump, wherein a shaft hole is formed in the runner along the direction of its axis, the motor shaft is arranged inside the shaft hole; an inclined hole is formed in the runner, the connecting rod is arranged inside the inclined hole, an axis of the inclined hole form an angle with respect to an axis of the motor shaft;

wherein, the inclined hole is a blind hole, and the inclined hole forms a step structure at a surface of the runner.

In the above-mentioned liquid pump, wherein two opposite magnet mounting columns are arranged on two sides of the runner along the direction of its axis, each of the magnet mounting columns is provided with a magnet therein, and the magnet rotates periodically with the runner, so as to cause a periodic change in the magnetic pole.

In the above-mentioned liquid pump, wherein the shaft hole comprises a first shaft hole portion for receiving the motor shaft, and a second shaft hole portion communicating with the first shaft hole portion and passing through a surface of the runner, wherein an internal diameter of the first shaft hole potion is greater than that of the second shaft hole portion, and the first shaft hole portion is coaxial with the second shaft hole portion.

In the above-mentioned liquid pump, wherein a surface of the runner, which is away from the driving mechanism, extends outwardly to form a stepped portion of the runner.

A liquid pump, comprising: an upper cover, a middle cover, and a lower cover sealingly connected to one another from top to bottom, and

further comprising: a casing, arranged at a lower end of the lower cover, a socket portion being formed on an outer peripheral wall of the casing, an accommodating cavity being formed inside the socket portion, one end of the accommodating cavity being provided with an opening, and the other end of the accommodating cavity being provided with a button hole;

a motor, a runner, and a magnet, a motor shaft of the motor passing through a lower end of the casing and extending to an interior of the casing and being fixedly connected to the runner, wherein, an outer peripheral wall of the runner includes two first planes parallel to each other, two magnet mounting columns are symmetrically disposed on each of the two first planes, each of the magnet mounting columns is provided with the magnet therein, the motor rotates periodically to drive the runner, so as to cause a periodic change in the magnetic pole;

a Hall sensor disposed inside the accommodating cavity, wherein the Hall sensor has a buckle matching the button hole, and the Hall sensor monitors the periodic change of the magnetic pole to generate a signal matching the rotation number of the motor.

In the above-mentioned liquid pump, wherein inner walls on both sides of the accommodating cavity are respectively provided with collision strips, two sides of the Hall sensor abut against the collision strips;

an inner wall of the accommodating cavity, which is closer to the casing, is provided with a limit clamping block, the limit clamping block extends from one end of the accommodating cavity to the other end thereof.

In the above-mentioned liquid pump, wherein the upper cover is provided with a fluid inlet and a fluid outlet;

the middle cover is provided with three inlet channels and three outlet channels, all the three inlet channels communicate with the fluid inlet, all the three outlet channels communicate with the fluid outlet;

the three outlet channels are arranged at the center of the middle cover, and the three inlet channels are arranged about a periphery of the three outlet channels.

The liquid pump further comprises a pump chamber mechanism, wherein the pump chamber mechanism is disposed between the middle cover and the casing, the pump chamber mechanism comprises, which are arranged from top to bottom, a mounting part, a connecting part, a squeezing part, an extending part, and a liming part;

the mounting part is arranged between the middle cover and the lower cover; the connecting part, the squeezing part, the extending part, and the limiting part are received inside the lower cover and/or the casing;

the connecting part is a flexible part, the connecting part has a hollow structure, the connecting part deforms reciprocately along the direction of its axis to vary the volume periodically, so as to introduce the fluid from the fluid inlet into the connecting part and/or discharging the fluid from the connecting part to the fluid outlet.

In the above-mentioned liquid pump, wherein the pump chamber mechanism comprises the mounting part and three connecting parts connected with the mounting part, and each of the connecting parts is connected to a squeezing part, an extending part, and a limiting part in series;

each of the connecting parts communicates with one of the inlet channels and one of the outlet channels only; and

the connecting parts are cylindrical or bowl-shaped, the squeezing part is cylindrical.

The liquid pump further comprises a plug, the plug is arranged at a middle portion of an upper surface of the middle cover, the plug allows a one-way flow of the fluid from the connecting part to the outlet channel;

a plug slot is arranged at the middle portion of the upper surface of the middle cover, the plug is disposed inside the plug slot, the outlet channels are also disposed inside the plug slot, a triangular plug positioning column is also disposed inside the plug slot;

the plug comprises:

a plug sealing surface, the plug sealing surface is an arc-shaped surface, a concave side of the plug sealing surface is arranged opposite to the three outlet channels;

a plug positioning block, the plug positioning block being triangular and arranged in the middle of a convex side of the plug sealing surface;

a triangular fixing hole, opening into an interior of the plug positioning block from the concave side of the plug sealing surface, wherein the triangular fixing hole matches the plug positioning column;

three reinforced support sections, wherein lower surfaces of the three reinforced support sections are connected to the convex side of the plug sealing surface, each of the reinforces support sections extends from an edge of the plug positioning block to an outer edge of the convex side of the plug sealing surface;

the three reinforced support sections divide the plug sealing surface into three plug sealing areas, and each of the plug sealing areas directly faces one of the three outlet channels.

The liquid pump further comprises three umbrella valves, wherein the three umbrellas valves are arranged at a lower surface of the middle cover and arranged about the circumference of the plug, each of the connecting parts is provided with one of the three umbrella valves, each of the umbrella valves allows a one-way flow of the fluid from the inlet channel to the connecting part;

each of the umbrella valves comprises:

an umbrella valve sealing surface, wherein the umbrella valve sealing surface is an arc-shaped surface, a concave side of the umbrella valve sealing surface directly faces the three inlet channels, a convex side of the umbrella valve sealing surface directly faces the connecting parts;

an umbrella valve support part, connected to the concave side of the umbrella valve sealing surface;

an umbrella valve connecting section, connected to the umbrella valve support part; and

a spherical fixing section, connected to the umbrella valve connecting section, and confining the umbrella valves to the middle cover through the umbrella valve support part, the umbrella valve connecting section, and the spherical fixing section.

In the above-mentioned liquid pump, wherein each of the inlet channels comprises: a crescent-shaped inlet sink, a plurality of inlet holes formed in the inlet sink, an umbrella valve positioning hole formed in the inlet sink;

wherein, the umbrella connecting section is arranged inside the umbrella valve positioning hole, the umbrella valve support part and the spherical fixing section are arranged at two sides of the umbrella valve positioning hole, respectively;

the plurality of inlet holes are formed around the umbrella valve positioning hole, and the umbrella valve sealing surface covers the plurality of inlet holes.

In the above-mentioned liquid pump, wherein each of the outlet channels comprises: a waist-shaped outlet hole, and a limited rod connecting inner walls of two sides of the outlet hole.

In the above-mentioned liquid pump, wherein the lower cover comprises: a lower cover plate, and a lower cover side wall connected to an outer edge of the lower cover plate, wherein three through grooves are formed on the lower cover plate for receiving the connecting parts, each of the through grooves is provided with one of the connecting parts;

a lower surface of the lower cover plate extends downwardly from an outer edge of the through grooves to form a holding part for protecting the connecting parts;

a lower surface of the mounting part has a positioning part, and an upper surface of the lower cover plate is provided with a positioning groove matching the positioning part.

The liquid pump further comprises an impeller, the impeller has an inclined plane, an angel is formed between the inclined plane and a plane where the mounting part is located, the impeller rotates around an axis of the motor shaft to cause the connecting part to deform reciprocately along a direction of its axis;

In the above-mentioned liquid pump, wherein three annular structures are arranged at an outer edge of the impeller, each of the annular structures is sleeved on the extending part, and the annular structures are defined between the squeezing part and the limiting part;

the impeller rotates about the axis of the motor shaft to cause the three annular structures to displace reciprocately along a direction of the axis, to cause the connecting part to deform reciprocately along a direction of its axis.

The liquid pump further comprises a connecting rod, the connecting rod connects the runner and the impeller, an angle is formed between an axis of the connecting rod and the axis of the motor shaft;

wherein, an upper end of the connecting rod is close to the axis of the motor shaft, and a lower end of the connecting rod is away from the axis of the motor shaft.

A working method of the liquid pump, wherein the liquid pump comprises: an upper cover, a middle cover, and a lower cover which are connected to one another from top to bottom, the liquid pump further comprises a motor, a runner, a magnet, and a Hall sensor, a motor shaft of the motor passes through the casing and is fixedly connected to the runner inside the casing, the magnets are arranged respectively on two sides of the runner, the Hall sensor monitors the magnet;

the upper cover is provided with a fluid inlet and a fluid outlet; the middle cover is provided with at least one inlet channel and at least one outlet channel, the inlet channel communicates with the fluid inlet, and the outlet channel communicates with the fluid outlet;

the liquid pump further comprises a leather cup, the leather cup communicates with the inlet channel and the outlet channel, a first one-way valve is provided between the inlet channel and the leather cup, a second one-way valve is provided between the leather cup and the outlet channel;

the liquid pump further comprises an impeller, the impeller is connected to the runner, an upper surface of the impeller is an inclined surface, an outer edge of the impeller is connected to the leather cup through a connection point;

the working method comprises:

the motor drives the runner to rotate, the runner drives the impeller to rotate about the axis of the motor shaft of the motor, the rotation of the impeller is converted into a reciprocating motion of the connection point to drive the leather cup to deform reciprocately, the leather cup is configured for introducing the fluid from the fluid inlet into the leather cup and/or discharging the fluid from the leather cup to the fluid outlet by periodical varying of the volume of the leather cup;

the magnet rotates with the runner so as to cause a periodic change in the magnetic pole, the Hall sensor monitors the periodic change of the magnetic pole to generate a pulse signal matching the rotation number of the motor;

the flow rate of the liquid pump is controlled by inputting instructions to the motor and by obtaining the number of cycles of the pulse signal.

By adopting the above-mentioned technical solutions, the present invention has the beneficial effects over the prior art:

1. the Hall sensor, together with the magnet, monitors the rotational speed of the motor, thereby controlling the motor to implement a precise control of the flow rate.

2. The one-way control of three outlet channels can be achieved by setting a plug, so that the internal space and costs of the liquid pump are saved.

3. With the arrangement of umbrellas valves and inlet channels and outlet channels in the present invention, each pump chamber mechanism may work independently without interfering with each other, and the internal space and costs of the liquid pump are saved.

4. The runner is designed such that quick assembly and disassembly of all the components are achieved, and a precise measurement and control of the working track of all the components are achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, together with the specification, illustrate exemplary embodiments of the present disclosure, and, together with the description, serve to explain the principles of the present invention.

FIG. 1 is a perspective view of a liquid pump according to the present invention;

FIG. 2 is a perspective view of a liquid pump according to the present invention;

FIG. 3 is a perspective view of a liquid pump according to the present invention;

FIG. 4 is a cross-sectional view of a liquid pump according to the present invention;

FIG. 4a is a cross-sectional view of a liquid pump according to the present invention;

FIG. 5 is an exploded view of a liquid pump according to the present invention;

FIG. 6 is an exploded view of a liquid pump according to the present invention;

FIG. 7 is a perspective view of an upper cover of a liquid pump according to the present invention;

FIG. 8 is a perspective view of an upper cover of a liquid pump according to the present invention;

FIG. 9 is a perspective view of a seal ring of a liquid pump according to the present invention;

FIG. 10 is a perspective view of a plug of a liquid pump according to the present invention;

FIG. 11 is a perspective view of a plug of a liquid pump according to the present invention;

FIG. 12a is a perspective view of a middle cover of a liquid pump according to the present invention;

FIG. 12b is a perspective view of a middle cover of a liquid pump according to the present invention;

FIG. 13 is a perspective view of a middle cover of a liquid pump according to the present invention;

FIG. 14 is a perspective view of an umbrella valve of a liquid pump according to the present invention;

FIG. 15 is a perspective view of an umbrella valve of a liquid pump according to the present invention;

FIG. 16 is a perspective view of an impeller of a liquid pump according to the present invention;

FIG. 17 is a perspective view of an impeller of a liquid pump according to the present invention;

FIG. 18 is a perspective view of a pump chamber mechanism of a liquid pump according to the present invention;

FIG. 19 is a perspective view of a pump chamber mechanism of a liquid pump according to the present invention;

FIG. 19a is a cross-sectional view of a pump chamber mechanism of a liquid pump according to the present invention;

FIG. 19b is a cross-sectional view of a pump chamber mechanism of a liquid pump according to the present invention;

FIG. 20 is a perspective view of a lower cover of a liquid pump according to the present invention;

FIG. 20a is a perspective view of a lower cover of a liquid pump according to the present invention;

FIG. 21 is a perspective view of a connecting rod, a runner, and a magnet of a liquid pump according to the present invention;

FIG. 22 is a perspective view of a connecting rod, a runner, and a magnet of a liquid pump according to the present invention;

FIG. 22a is a cross-sectional view of a runner of a liquid pump according to the present invention;

FIG. 23 is a perspective view of a casing, a motor, and a Hall sensor of a liquid pump according to the present invention;

FIG. 24a is a perspective view of a casing of a liquid pump according to the present invention; and

FIG. 24b is a perspective view of a casing of a liquid pump according to the present invention.

In the accompanying drawings: 100 upper cover; 1001 fluid inlet; 1002 fluid outlet; 101 middle cover; 1011 inlet channel; 1011 a inlet sink; 1011 b inlet hole; 1011 c umbrella valve positioning hole; 1012 outlet channel; 1012 a outlet hole; 1012 b limited rob; 1013 plug slot; 1014 plug positioning column; 102 lower cover; 1021 lower cover plate; 1022 lower cover side wall; 1023 through grooves; 1024 holding part; 1025 positioning groove; 103 casing; 1031 socket part; 1032 button hole; 1033 collision strip; 1034 limit clamping block; 1035 first plate; 1036 second plate; 1037 third plate; 104 motor; 105 runner; 1051 magnet mounting column; 1052 shaft hole; 1052 a first shaft hole portion; 1052 b second shaft hole portion; 1053 inclined hole; 1053 a step structure; 1054 runner stepped portion; 106 magnet; 107 Hall sensor; 108 pump chamber mechanism; 1081 mounting part; 1081 a positioning part; 1082 connecting part; 1083 squeezing part; 1084 extending part; 1085 limiting part; 109 plug; 1091 plug sealing surface; 1092 plug positioning block; 1093 triangular fixing hole; 1094 reinforced support sections; 110 umbrella valve; 1101 umbrella valve sealing surface; 1102 umbrella valve support part; 1103 umbrella valve connecting section; 1104 spherical fixing section; 111 impeller; 1111 annular structure; 1112 impeller connecting part; 1113 impeller body; 1114 measurement slot; 112 connecting rod; 113 seal ring; 1131 avoiding slot; 1132 avoiding slot; 1133 avoiding slot.

DETAILED DESCRIPTION

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals refer to like elements throughout.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” or “has” and/or “having” when used herein, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used herein, “around”, “about” or “approximately” shall generally mean within 20 percent, preferably within 10 percent, and more preferably within 5 percent of a given value or range. Numerical quantities given herein are approximate, meaning that the term “around”, “about” or “approximately” can be inferred if not expressly stated.

As used herein, the term “plurality” means a number greater than one.

Hereinafter, certain exemplary embodiments according to the present disclosure will be described with reference to the accompanying drawings.

Referring to FIGS. 1 to 24 b, a preferred embodiment of a liquid pump is provided, comprising an upper cover 100, a middle cover 101, and a lower cover 102 sealingly connected to one another from top to bottom, and further comprising: a casing 103, arranged at a lower end of the lower cover 102, a socket portion 1031 being formed on an outer peripheral wall of the casing 103, an accommodating cavity being formed inside the socket portion 1031, one end of the accommodating cavity being provided with an opening, and the other end of the accommodating cavity being provided with a button hole 1032.

Preferably, a middle cover 101, and a lower cover 102, and the casing 103 are fixedly connected by means of a plurality of screws located at an outer edge thereof. The upper cover 100 is removably connected to the middle cover 101 by means of a plurality of buckles located at an outer edge thereof.

A seal ring 113 is provided between the upper cover 101 and the lower cover 102, and an outer edge of the seal ring 113 preferably has a plurality of avoiding slots 1131 to avoid the screws.

Preferably, the casing 103 also has a fixing structure for fixing the entire liquid pump to other mechanisms/devices. The fixing structure comprises: a triangular first plate 1035 which is radially arranged, a second plate 1036 vertically connected to the first plate 1035, and at least one third plate 1037 for connecting the first plate 1035 and the second plate 1036 for reinforcement. A fixing hole or a threaded hole is formed in the second plate 1036.

Preferably, when the casing 103 is assembled, the third plate 1037 abuts against or is fixed to an outer wall of the motor 104 with respect to the other side of the first plate 1035.

Furthermore, as a preferred embodiment, a motor 104, a runner 105, and a magnet 106, a motor shaft of the motor 104 passes through a lower end of the casing 103 and extends to an interior of the casing 103 and is fixedly connected to the runner 105, wherein, an outer peripheral wall of the runner 105 includes two first planes parallel to each other, two magnet mounting columns 1051 are disposed on each of the two first planes. Preferably, the two magnet mounting columns 1051 are hollow cylindrical structures. Axes of the two magnet mounting columns 1051 are preferably arranged perpendicular to the axis of the casing 103. The two magnet mounting columns 1051 are symmetrically disposed. Each of the magnet mounting columns 1051 is provided with a magnet 106 therein, and the two magnets 106 have different magnetic poles. The motor 104 rotates periodically to drive the runner 105, so as to cause a periodic change in the magnetic pole.

Furthermore, as a preferred embodiment, the liquid pump further comprises: a Hall sensor 107 disposed inside the accommodating cavity, wherein the Hall sensor 107 has a buckle 1071 matching the button hole 1032, and the Hall sensor 107 monitors the periodic change of the magnetic pole to generate a signal matching the rotation number of the motor 104.

Furthermore, as a preferred embodiment, inner walls on both sides of the accommodating cavity are respectively provided with collision strips 1033, two sides of the Hall sensor 107 abut against the collision strips 1033 respectively. The collision strips 1033 limits the position of the Hall sensor 107.

Furthermore, as a preferred embodiment, an inner wall of the accommodating cavity, which is closer to the cylindrical portion of the casing 103, is provided with a limit clamping block 1034, the limit clamping block 1034 extends from one end of the accommodating cavity to the other end thereof. The collision strips 1033 limits the position of the Hall sensor 107.

Furthermore, as a preferred embodiment, the upper cover 100 is provided with a fluid inlet 1001 and a fluid outlet 1002.

Furthermore, as a preferred embodiment, the middle cover 101 is provided with three inlet channels 1011 and three outlet channels 1012, all the three inlet channels 1011 communicate with the fluid inlet 1001, all the three outlet channels 1012 communicate with the fluid outlet 1002.

Furthermore, as a preferred embodiment, the three outlet channels 1012 are arranged at the center of the middle cover 101, and the three inlet channels 1011 are arranged about a periphery of the three outlet channels 1012.

Preferably, the seal ring 113 has an avoiding slot 1132 for avoiding the inlet channels 1011 and avoiding slots 1133 for the outlet channels 1012. Wherein, the avoiding slot 1132 located at a center of the seal ring 113, and the avoiding slot 1132 is circular; the avoiding slots 1133 are disposed around the avoiding slot 1132, and they are crescent-shaped.

Furthermore, as a preferred embodiment, the liquid pump further comprises: a pump chamber mechanism 108, wherein the pump chamber mechanism 108 is disposed between the middle cover 101 and the casing 103, the pump chamber mechanism 108 comprises, which are arranged from top to bottom, a mounting part 1081, a connecting part 1082, a squeezing part 1083, an extending part 1084, and a liming part 1085.

Furthermore, as a preferred embodiment, the mounting part 1081 is arranged between the middle cover 101 and the lower cover 103; the connecting part 1082, the squeezing part 1083, the extending part 1084, and the limiting part 1085 are received inside the lower cover 102 and/or the casing 103.

Furthermore, as a preferred embodiment, the connecting part 1082 is a flexible part, the connecting part 1082 has a hollow structure, the connecting part 1082 deforms reciprocately along the direction of its axis to vary the volume periodically, so as to introduce the fluid from the fluid inlet into the connecting part 1082 and/or discharging the fluid from the connecting part to the fluid outlet 1002. The movement of the squeezing part 1083 in a horizontal direction shown in FIG. 19 makes the connecting part 1082 deform, leading to the change of the volume of the connecting part 1082. When the squeezing part 1083 periodically moves back and forth in the horizontal direction shown in FIG. 19, the connecting part 1082 periodically changes the volume thereof accordingly.

Furthermore, as a preferred embodiment, the pump chamber mechanism 108 comprises a mounting part 1081 and three connecting parts 1082 connected with the mounting part 1081, and each of the connecting parts 1082 is connected to a squeezing part 1083, an extending part 1084, and a limiting part 1085 in series.

Furthermore, as a preferred embodiment, each of the connecting parts 1082 communicates with one of the inlet channels 1011 and one of the outlet channels 1012 only, therefore, in each of the connecting parts 1082, fluid enters the connecting part 1082 from a separate inlet channel 1011, and discharges to the connecting part 1082 from a separate outlet channel 1012, that is, each of the connecting parts 1082 is configured for the entering and discharging the fluid without mutual interference.

Furthermore, as a preferred embodiment, the connecting parts 1082 are cylindrical or bowl-shaped, and the squeezing part 1083 is cylindrical.

Furthermore, as a preferred embodiment, the liquid pump further comprises a plug 109, the plug 109 is arranged at a middle portion of an upper surface of the middle cover 101, the plug 109 allows a one-way flow of the fluid from the connecting part 1082 to the outlet channel 1012.

Furthermore, as a preferred embodiment, a plug slot 1013 is arranged at the middle portion of the upper surface of the middle cover 101, the plug 109 is disposed inside the plug slot 1013, the outlet channels 1012 are also disposed inside the plug slot 1012, a triangular plug positioning column 1014 is also disposed inside the plug slot 1013.

Furthermore, as a preferred embodiment, the plug 109 comprises: a plug sealing surface 1091, the plug sealing surface 1091 is an arc-shaped surface, a concave side of the plug sealing surface 1091 is arranged opposite to the three outlet channels 1012.

Furthermore, as a preferred embodiment, the plug 109 comprises: a plug positioning block 1092, the plug positioning block 1092 is triangular and is arranged in the middle of a convex side of the plug sealing surface 1091.

Furthermore, as a preferred embodiment, the plug 109 comprises: a triangular fixing hole 1093, opening into an interior of the plug positioning block 1092 from the concave side of the plug sealing surface 1091, wherein the triangular fixing hole 1093 matches the plug positioning column 1014.

Furthermore, as a preferred embodiment, the plug 109 comprises: three reinforced support sections 1094, wherein lower surfaces of the three reinforced support sections 1094 are connected to the convex side of the plug sealing surface 1091, each of the reinforces support sections 1094 extends from an edge of the plug positioning block 1092 to an outer edge of the convex side of the plug sealing surface 1091.

Furthermore, as a preferred embodiment, the three reinforced support sections 1094 divide the plug sealing surface 1091 into three plug sealing areas, and each of the plug sealing areas directly faces one of the three outlet channels 1012.

Specifically, when the connecting part 1082 deforms due to the pushing force of the squeezing part 1083, the volume of the connecting part 1082 is reduced, the fluid in the connecting part 1082 moves toward the outlet channel 1012; the plug sealing surface 1091 is deformed due to the squeezing force, and the outlet channel 1012 is exposed, so that the fluid is discharged out.

On the other hand, when the connecting part 1082 deforms due to the pulling force of the squeezing part 1083, the volume of the connecting part 1082 is increased, negative pressure forms inside of the connecting part 1082. Since the plug sealing surface 1091 is an arc-shaped surface, the corresponding plug sealing area of the plug sealing surface 1091 is absorbed on the middle cover 102, the outlet channel 1012 is blocked, so as to prevent the backflow of the fluid. Therefore, the plug 109 serves as the one-way valve.

Specifically, the structure of the plug 109 allows the plus 109 to function as a one-way valve for the three outlet channels 1012. In the meantime, the structure of the plug sealing area allows the three outlet channels 1012 which function as one-way valves do not interfere with each other.

Furthermore, as a preferred embodiment, the liquid pump further comprises three umbrella valves 110, wherein the three umbrella valves 110 are arranged at a lower surface of the middle cover 101 and arranged about the circumference of the plug 109, each of the connecting parts 1082 is provided with one of the three umbrella valves 110, each of the umbrella valves 110 allows a one-way flow of the fluid from the inlet channel 1011 to the connecting part 1082.

Furthermore, as a preferred embodiment, each of the umbrella valves 110 comprises: an umbrella valve sealing surface 1101, wherein the umbrella valve sealing surface 1101 is an arc-shaped surface, a concave side of the umbrella valve sealing surface 1101 directly faces the three inlet channels 1011, a convex side of the umbrella valve 1101 sealing surface directly faces the connecting parts 1082.

Furthermore, as a preferred embodiment, each of the umbrella valves 110 comprises: an umbrella valve support part 1102, connected to the concave side of the umbrella valve sealing surface 1101.

Furthermore, as a preferred embodiment, each of the umbrella valves 110 comprises: an umbrella valve connecting section 1103, connected to the umbrella valve support part 1102.

Furthermore, as a preferred embodiment, each of the umbrella valves 110 comprises: a spherical fixing section 1104, connected to the umbrella valve connecting section 1103, and confining the umbrella valves 110 to the middle cover 101 through the umbrella valve support part 1102, the umbrella valve connecting section 1103, and the spherical fixing section 1104.

Specifically, when the connecting part 1082 deforms due to the pulling force of the squeezing part 1083, the volume of the connecting part 1082 is increased, negative pressure forms inside of the connecting part 1082, the external fluid moves toward the inlet channel 1011. Since the umbrella valve sealing surface 1101 is an arc-shaped structure, the fluid pushes out the umbrella valve sealing surface 1101, then the inlet channel 1101 opens, the fluid enters into the connecting part 1082, so that the fluid enters. On the other hand, when the connecting part 1082 deforms due to the pressing force of the squeezing part 1083, the volume of the connecting part 1082 is reduced, the fluid presses the umbrella valve sealing surface 1101 against the inlet channel 1011, the inlet channel 1011 is blocked, so as to prevent the backflow of the fluid. Therefore, the umbrella valve 110 serves as the one-way valve.

Furthermore, as a preferred embodiment, each of the inlet channels 1101 comprises: a crescent-shaped inlet sink 1011 a, a plurality of inlet holes 1011 b formed in the inlet sink 1011 a, an umbrella valve positioning hole 1011 c formed in the inlet sink 1011 a.

Furthermore, as a preferred embodiment, the umbrella connecting section 1103 is arranged inside the umbrella valve positioning hole 1011 c, the umbrella valve support part 1102 and the spherical fixing section 1104 are arranged at two sides of the umbrella valve positioning hole 1011 c, respectively.

Furthermore, as a preferred embodiment, the plurality of inlet holes 1011 b are formed around the umbrella valve positioning hole 1011 c, and the umbrella valve sealing surface 1101 covers the plurality of inlet holes 1011 b.

Furthermore, as a preferred embodiment, each of the outlet channels 1012 comprises: a waist-shaped outlet hole 1012 a, and a limited rod 1012 b connecting inner walls of two sides of the outlet hole 1012 a. The limited rod 1012 b is configured to prevent the plug sealing surface 1091 of the plug being sucked into the outlet hole 1012 a.

In another preferred embodiment, the waist-shaped outlet hole 1012 a is replaced by a small round hole. The small round hole can also prevent the plug sealing surface 1091 being sucked into the small round hole. However, in this case, the hole diameter of the outlet hole is smaller than that of the waist-shaped outlet hole 1012 a.

Furthermore, as a preferred embodiment, preferably, the inlet channel 1011 and the outlet channel 1012 integrally form a substantially round structure to match the shape of the connecting part 1082. In this way, an inlet channel 1011 and an outlet channel 1012 are configured for each of the connecting parts 1082 while the internal space of the liquid pump is saved as much as possible.

Furthermore, as a preferred embodiment, the lower cover 102 comprises: a lower cover plate 1021, and a lower cover side wall 1022 connected to an outer edge of the lower cover plate 1021, wherein three through grooves 1023 are formed on the lower cover plate 1021 for receiving at least the connecting parts 1082, each of the through grooves 1023 is provided with one of the connecting parts 1082.

Furthermore, as a preferred embodiment, a lower surface of the lower cover plate 1021 extends downwardly from an outer edge of the through grooves 1023 to form a holding part 1024 for protecting the connecting parts 1082.

Furthermore, as a preferred embodiment, a lower surface of the mounting part 1081 has a positioning part 1081 a, and an upper surface of the lower cover plate 1021 is provided with a positioning groove 1025 matching the positioning part 1081 a.

Furthermore, as a preferred embodiment, the liquid pump further comprises an impeller 111, the impeller 111 has an inclined surface, that is, a left surface of the impeller 111 shown in FIG. 16. An angel is formed between the inclined surface and a plane where the mounting part 1081 is located, the impeller 111 rotates around an axis of the motor shaft to cause the connecting part 1082 to deform reciprocately along a direction of its axis.

Furthermore, as a preferred embodiment, three annular structures 1111 are arranged at an outer edge of the impeller 111, each of the annular structures 1111 is sleeved on the extending part 1084, and the annular structures 1111 are defined between the squeezing part 1083 and the limiting part 1085.

Specifically, the impeller 111 comprises: an impeller connecting part 1112, an impeller body 1113 and the above-mentioned annular structures 1111 arranged at an outer edge of the impeller body 1113. A connecting rod slot 1115 is formed in the impeller connecting part 1112 for connecting to the connecting rod 112 as described below. Preferably, the impeller body 1113 is substantially triangular. The annular structures 1111 are respectively arranged at three corners of the impeller body 1113.

Preferably, a measuring slot 1114 is formed at a center of the impeller body 1113. The measuring slot 1114 communicates with the connecting rod slot 1115. The measuring slot 1114 is coaxial with the connecting rod slot 1115, so as to facilitate the measurement of the distance between the connecting rod 112 and the annular structures 1111.

Furthermore, as a preferred embodiment, the impeller 111 rotates around the axis of the motor shaft to cause the three annular structures 1111 to displace reciprocately along a direction of the axis, and thus to cause the connecting part 1082 to deform reciprocately along a direction of its axis.

Specifically, since the impeller 111 is inclined, when rotating or eccentrically rotating around a horizontal axis shown in FIG. 16, the impeller 111 is capable of transforming the rotation or eccentric rotation thereof into the movement of the annular structures 1111 in the horizontal direction shown in FIG. 16, so as to generate the pushing force on the squeezing part 1083 or to generate pulling force on the limiting part 1085, thereby reducing or expanding the volume of the connecting part 1082.

Furthermore, as a preferred embodiment, the liquid pump further comprises a connecting rod 112 connecting the runner 105 and the impeller 111, an axis of the connecting rod 112 form an angle with respect to an axis of the motor shaft.

Furthermore, as a preferred embodiment, an upper end of the connecting rod 112 is close to the axis of the motor shaft, and a lower end of the connecting rod 112 is away from the axis of the motor shaft.

The above descriptions are only the preferred embodiments of the invention, not thus limiting the embodiments and scope of the invention.

The invention can also be embodied in the following embodiments apart from the above-mentioned embodiments:

In a further embodiment of the present invention, referring to FIGS. 1 to 24 b, a shaft hole 1052 is formed in the runner 105 along a direction of its axis, the motor shaft is arranged inside the shaft hole 1052; an inclined hole 1053 is formed in the runner 105, the connecting rod 112 is arranged inside the inclined hole 1053, an axis of the inclined hole 1053 form an angle with respect to an axis of the shaft hole 1052.

In a further embodiment of the present invention, the inclined hole 1053 is a blind hole, and the inclined hole 1053 forms a step structure 1053 a at a surface of the runner. The step structure 1053 a is arranged such that the abrasion can be prevented.

Specifically, the step structure 1053 a comprises: a step expanding portion having a diameter greater than that of the inclined hole 1053, and a step connecting portion having a diameter gradually decreasing toward the inclined hole 1053. One end of the step connecting portion, with a larger diameter, has a diameter equal to that of the step expanding portion, and the other end of the step connecting portion, with a smaller diameter, has a diameter equal to that of the inclined hole 1053.

In a further embodiment of the present invention, two opposite magnet mounting columns 1051 are arranged on two sides of the runner 105 along a direction of its axis, each of the magnet mounting columns 1051 is provided with a magnet 106 therein, and the magnet 106 rotates periodically with the runner 105, so as to cause a periodic change in the magnetic pole.

In a further embodiment of the present invention, the shaft hole 1052 comprises a first shaft hole portion 1052 a for receiving the motor shaft, and a second shaft hole portion 1052 b communicating with the first shaft hole portion 1052 a and passing through a surface of the runner 105, wherein an internal diameter of the first shaft hole potion 1052 a is greater than that of the second shaft hole portion 1052 b, and the first shaft hole portion 1052 a is coaxial with the second shaft hole portion 1052 b.

Specifically, the second shaft hole portion 1052 b is not necessarily for the accommodation or installation of the motor shaft. The second shaft hole portion 1052 b is arranged to facilitate the measurement of a distance between the motor shaft and the inclined hole 1053, so as to achieve the precise control of the movement of the liquid pump.

In a further embodiment of the present invention, a surface of the runner 105, which is away from the motor 104, extends outwardly to form a stepped portion 1054 of the runner. The stepped portion 1054 of the runner is disposed such that the entire runner 105 can be easily detached integrally.

In a further embodiment of the present invention, a working method of the liquid pump is provided, wherein the liquid pump comprises: an upper cover 100, a middle cover 101, a lower cover 102 and a casing 103 connected to one another from top to bottom, the liquid pump further comprises a motor 104, a runner 105, a magnet 106, and a Hall sensor 107, a motor shaft of the motor 104 passes through the casing 103 and is fixedly connected to the runner 105 inside the casing 103, the magnets 106 are arranged on two sides of the runner 105 respectively, the Hall sensor 107 monitors the magnet 106.

The upper cover 100 is provided with a fluid inlet 1001 and a fluid outlet 1002; the middle cover 101 is provided with at least one inlet channel 1011 and at least one outlet channel 1012, the inlet channel 1011 communicates with the fluid inlet 1001, and the outlet channel 1012 communicates with the fluid outlet 1002.

In the method, the liquid pump further comprises a leather cup (i.e., the pump chamber mechanism 108), the leather cup communicates with the inlet channel 1011 and the outlet channel 1012, a first one-way valve (i.e., the umbrella valve 110) is provided between the inlet channel 1011 and the leather cup, a second one-way valve (i.e., the plug 109) is provided between the leather cup and the outlet channel 1012;

in the method, the liquid pump further comprises an impeller 111, the impeller 111 is connected to the runner 105, an upper surface of the impeller 111 is an inclined surface, an outer edge of the impeller 111 is connected to the leather cup through a connection point;

the working method comprises:

the motor 104 drives the runner 105 to rotate, the runner 105 drives the impeller 111 to rotate around the axis of the motor shaft of the motor 104, by the inclined surface of the impeller 111 the rotation of the is converted into a reciprocating motion of the connection point to drive the leather cup to deform reciprocately, the leather cup is configured for introducing the fluid 1001 from the fluid inlet 1001 into the leather cup and/or discharging the fluid from the leather cup to the fluid outlet 1002 by periodical varying of the volume of the leather cup;

the magnet 106 rotates with the runner 105 so as to cause a periodic change in the magnetic pole, the Hall sensor 107 monitors the periodic change of the magnetic pole to generate a pulse signal matching the rotation number of the motor 104;

the flow rate of the liquid pump is controlled by inputting instructions to the motor 104 and by obtaining the number of cycles of the pulse signal.

The above descriptions are only the preferred embodiments of the invention, not thus limiting the embodiments and scope of the invention. Those skilled in the art should be able to realize that the schemes obtained from the content of specification and drawings of the invention are within the scope of the invention. 

What is claimed is:
 1. A liquid pump, comprising: a fluid inlet, a fluid outlet, and a pump chamber, the fluid inlet and the fluid outlet being respectively communicate with the pump chamber, the pump chamber being configured for introducing the fluid from the fluid inlet into the pump chamber and/or discharging the fluid from the pump chamber to the fluid outlet by periodical varying of volume of the pump chamber; further comprising: a driving mechanism, the driving mechanism driving the pump chamber to vary the volume of the pump chamber periodically by periodical rotating of the driving mechanism; further comprising: a runner, the runner being driven by the driving mechanism and rotating periodically therewith, the periodical rotation of the runner causing a magnetic pole arranged thereon to change periodically; and a Hall sensor, monitoring the periodic change of the magnetic pole to generate a signal matching the rotation number of the driving mechanism.
 2. The liquid pump of claim 1, wherein at least a part of the pump chamber is made of a flexible component, the flexible component deforms reciprocately along a direction of its axis to vary the volume periodically; the liquid pump further comprises a transmission component, the driving mechanism drives the transmission component to rotate, the transmission component has an inclined surface, an angle is formed between the inclined surface and a radial surface of the flexible component, and the inclined surface rotates about the axis so that the flexible component deforms reciprocately along the direction of its axis.
 3. The liquid pump of claim 2, wherein the driving mechanism is a motor, a motor shaft of the motor is fixedly connected to the runner; the liquid pump further comprises a connecting rod for connecting the runner and the transmission component, an axis of the connecting rod form an angle with respect to an axis of the motor shaft.
 4. The liquid pump of claim 3, wherein a shaft hole is formed in the runner along the direction of its axis, the motor shaft is arranged inside the shaft hole; an inclined hole is formed in the runner, the connecting rod is arranged inside the inclined hole, an axis of the inclined hole form an angle with respect to an axis of the motor shaft; wherein, the inclined hole is a blind hole, and the inclined hole forms a step structure at a surface of the runner.
 5. The liquid pump of claim 3, wherein two opposite magnet mounting columns are arranged on two sides of the runner along the direction of its axis, each of the magnet mounting columns is provided with a magnet therein, and the magnet rotates periodically with the runner, so as to cause a periodic change in the magnetic pole.
 6. The liquid pump of claim 4, wherein the shaft hole comprises a first shaft hole portion for receiving the motor shaft, and a second shaft hole portion communicating with the first shaft hole portion and passing through a surface of the runner, wherein an internal diameter of the first shaft hole potion is greater than that of the second shaft hole portion, and the first shaft hole portion is coaxial with the second shaft hole portion.
 7. The liquid pump of claim 1, wherein a surface of the runner, which is away from the driving mechanism, extends outwardly to form a stepped portion of the runner.
 8. A liquid pump, comprising: an upper cover, a middle cover, and a lower cover sealingly connected to one another from top to bottom, and further comprising: a casing, arranged at a lower end of the lower cover, a socket portion being formed on an outer peripheral wall of the casing, an accommodating cavity being formed inside the socket portion, one end of the accommodating cavity being provided with an opening, and the other end of the accommodating cavity being provided with a button hole; a motor, a runner, and a magnet, a motor shaft of the motor passing through a lower end of the casing and extending to an interior of the casing and being fixedly connected to the runner, wherein, an outer peripheral wall of the runner includes two first planes parallel to each other, two magnet mounting columns are symmetrically disposed on each of the two first planes, each of the magnet mounting columns is provided with the magnet therein, the motor rotates periodically to drive the runner, so as to cause a periodic change in the magnetic pole; a Hall sensor disposed inside the accommodating cavity, wherein the Hall sensor has a buckle matching the button hole, and the Hall sensor monitors the periodic change of the magnetic pole to generate a signal matching the rotation number of the motor.
 9. The liquid pump of claim 6, wherein inner walls on both sides of the accommodating cavity are respectively provided with collision strips, two sides of the Hall sensor abut against the collision strips; an inner wall of the accommodating cavity, which is closer to the casing, is provided with a limit clamping block, the limit clamping block extends from one end of the accommodating cavity to the other end thereof.
 10. The liquid pump of claim 6, wherein the upper cover is provided with a fluid inlet and a fluid outlet; the middle cover is provided with three inlet channels and three outlet channels, all the three inlet channels communicate with the fluid inlet, all the three outlet channels communicate with the fluid outlet; the three outlet channels are arranged at the center of the middle cover, and the three inlet channels are arranged about a periphery of the three outlet channels.
 11. The liquid pump of claim 10, further comprising: a pump chamber mechanism, wherein the pump chamber mechanism is disposed between the middle cover and the casing, the pump chamber mechanism comprises, which are arranged from top to bottom, a mounting part, a connecting part, a squeezing part, an extending part, and a liming part; the mounting part is arranged between the middle cover and the lower cover; the connecting part, the squeezing par, the extending part, and the limiting part are received inside the lower cover and/or the casing; the connecting part is a flexible part, the connecting part has a hollow structure, the connecting part deforms reciprocately along the direction of its axis to vary the volume periodically, so as to introduce the fluid from the fluid inlet into the connecting part and/or discharging the fluid from the connecting part to the fluid outlet.
 12. The liquid pump of claim 11, wherein the pump chamber mechanism comprises the mounting part and three connecting parts connected with the mounting part, and each of the connecting parts is connected to a squeezing part, an extending part, and a limiting part in series; each of the connecting parts communicates with one of the inlet channels and one of the outlet channels only; and the connecting parts are cylindrical or bowl-shaped, the squeezing part is cylindrical.
 13. The liquid pump of claim 12, further comprising: a plug, the plug being arranged at a middle portion of an upper surface of the middle cover, the plug allows a one-way flow of the fluid from the connecting part to the outlet channel; a plug slot is arranged at the middle portion of the upper surface of the middle cover, the plug is disposed inside the plug slot, the outlet channels are also disposed inside the plug slot, a triangular plug positioning column is also disposed inside the plug slot; the plug comprises: a plug sealing surface, the plug sealing surface is an arc-shaped surface, a concave side of the plug sealing surface is arranged opposite to the three outlet channels; a plug positioning block, the plug positioning block being triangular and arranged in the middle of a convex side of the plug sealing surface; a triangular fixing hole, opening into an interior of the plug positioning block from the concave side of the plug sealing surface, wherein the triangular fixing hole matches the plug positioning column; three reinforces support sections, wherein lower surfaces of the three reinforced support sections are connected to the convex side of the plug sealing surface, each of the reinforces support sections extends from an edge of the plug positioning block to an outer edge of the convex side of the plug sealing surface; the three reinforced support sections divide the plug sealing surface into three plug sealing areas, and each of the plug sealing areas directly faces one of the three outlet channels.
 14. The liquid pump of claim 13, further comprising: three umbrella valves, wherein the three umbrellas valves are arranged at a lower surface of the middle cover and arranged about the circumference of the plug, each of the connecting parts is provided with one of the three umbrella valves, each of the umbrella valves allows a one-way flow of the fluid from the inlet channel to the connecting part; each of the umbrella valves comprises: an umbrella valve sealing surface, wherein the umbrella valve sealing surface is an arc-shaped surface, a concave side of the umbrella valve sealing surface directly faces the three inlet channels, a convex side of the umbrella valve sealing surface directly faces the connecting parts; an umbrella valve support part, connected to the concave side of the umbrella valve sealing surface; an umbrella valve connecting section, connected to the umbrella valve support part; and a spherical fixing section, connected to the umbrella valve connecting section, and confining the umbrella valves to the middle cover through the umbrella valve support part, the umbrella valve connecting section, and the spherical fixing section.
 15. The liquid pump of claim 14, wherein each of the inlet channels comprises: a crescent-shaped inlet sink, a plurality of inlet holes formed in the inlet sink, an umbrella valve positioning hole formed in the inlet sink; wherein, the umbrella connecting section is arranged inside the umbrella valve positioning hole, the umbrella valve support part and the spherical fixing section are arranged at two sides of the umbrella valve positioning hole, respectively; the plurality of inlet holes are formed around the umbrella valve positioning hole, and the umbrella valve sealing surface covers the plurality of inlet holes.
 16. The liquid pump of claim 15, wherein each of the outlet channels comprises: a waist-shaped outlet hole, and a limited rod connecting inner walls of two sides of the outlet hole.
 17. The liquid pump of claim 11, wherein the middle cover comprises: a lower cover plate, and a lower cover side wall connected to an outer edge of the lower cover plate, wherein three through grooves are formed on the lower cover plate for receiving at least the connecting parts, each of the through grooves is provided with one of the connecting parts; a lower surface of the lower cover plate extends downwardly from an outer edge of the through grooves to form a holding part for protecting the connecting parts; a lower surface of the mounting part has a positioning part, and an upper surface of the lower cover plate is provided with a positioning groove matching the positioning part.
 18. The liquid pump of claim 11, further comprising: an impeller, the impeller having an inclined plane, an angel is formed between the inclined plane and a plane where the mounting part is located, the impeller rotates around an axis of the motor shaft to cause the connecting part to deform reciprocately along a direction of its axis; three annular structures are arranged at an outer edge of the impeller, each of the annular structures is sleeved on the extending part, and the annular structures are defined between the squeezing part and the limiting part; the impeller rotates about the axis of the motor shaft to cause the three annular structures to displace reciprocately along a direction of the axis, to cause the connecting part to deform reciprocately along a direction of its axis.
 19. The liquid pump of claim 18, further comprising: a connecting rod connecting the runner and the impeller, an angle being formed between an axis of the connecting rod and the axis of the motor shaft; wherein, an upper end of the connecting rod is close to the axis of the motor shaft, and a lower end of the connecting rod is away from the axis of the motor shaft.
 20. A working method of the liquid pump, wherein the liquid pump comprises: an upper cover, a middle cover, and a lower cover which are connected to one another from top to bottom, the liquid pump further comprises a motor, a runner, a magnet, and a Hall sensor, a motor shaft of the motor passes through the casing and is fixedly connected to the runner inside the casing, the magnets are arranged respectively on two sides of the runner, the Hall sensor monitors the magnet; the upper cover is provided with a fluid inlet and a fluid outlet; the middle cover is provided with at least one inlet channel and at least one outlet channel, the inlet channel communicates with the fluid inlet, and the outlet channel communicates with the fluid outlet; the liquid pump further comprises a leather cup, the leather cup communicates with the inlet channel and the outlet channel, a first one-way valve is provided between the inlet channel and the leather cup, a second one-way valve is provided between the leather cup and the outlet channel; the liquid pump further comprises an impeller, the impeller is connected to the runner, an upper surface of the impeller is an inclined surface, an outer edge of the impeller is connected to the leather cup through a connection point; the working method comprises: the motor drives the runner to rotate, the runner drives the impeller to rotate about the axis of the motor shaft of the motor, the rotation of the impeller is converted into a reciprocating motion of the connection point to drive the leather cup to deform reciprocately, the leather cup is configured for introducing the fluid from the fluid inlet into the leather cup and/or discharging the fluid from the leather cup to the fluid outlet by periodical varying of the volume of the leather cup; the magnet rotates with the runner so as to cause a periodic change in the magnetic pole, the Hall sensor monitors the periodic change of the magnetic pole to generate a pulse signal matching the rotation number of the motor; the flow rate of the liquid pump is controlled by inputting instructions to the motor and by obtaining the number of cycles of the pulse signal. 